<template>

    <div class="todo-header">
      <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
    </div>

</template>

<script>
import {nanoid} from 'nanoid'

export default {
  // eslint-disable-next-line vue/multi-word-component-names
  name: "Header",
  data(){
    return{
      title:'',
    }
  },
  methods:{

    add(){
      //校验数据
      if(!this.title.trim()){
        return alert('不能为空输入')
      }
      // event.target.value  target获取发生事件元素
      // console.log(this.title)
    //  将用户的输入包装成todo对象
    //  nanoid() 库中有生成标准的id变量
    //  通知app组件添加
      const todoObj = {id:nanoid(),title:this.title,done:false}
      this.addTodo(todoObj)
      //清空输入
      this.title = ''
    }
  },
  props:['addTodo']
}
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>